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Dynamic Web TWAIN是一个专为Web应用程序设计的TWAIN扫描识别控件。你只需在TWAIN接口写几行代码，就可以用兼容TWAIN的扫描仪扫描文档或从数码相机/采集卡中获取图像。然后用户可以编辑图像并将图像保存为多种格式，用户可保存图像到远程数据库或者SharePoint。该TWAIN控件还支持上传和处理本地图像。

本文汇集了一些Dynamic Web TWAIN编程方面的常见问题，并且针对这些问题进行了回答，感兴趣的朋友快来了解一下吧~

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问题1：如何在不显示设备选择对话框的情况下选择设备？

答：代码如下：

DWObject.OpenSourceManager();.OpenSourceManager();

for(i = 0, i<=DWObject.SourceCount - 1,i++){for(i = 0, i<=DWObject.SourceCount - 1,i++){
    if (DWObject.GetSourceNameItems(i) == "Specified device name")if (DWObject.GetSourceNameItems(i) == "Specified device name")
        DWObject.SelectSourceByIndex (i);DWObject.SelectSourceByIndex (i);
}}

//if can't find the specified source, it'll select default source//if can't find the specified source, it'll select default source
DWObject.AcquireImage(); DWObject.AcquireImage(); 

问题2：在没有UI的情况下获取图像时如何禁用进度指示器对话框？

答：代码如下：

DWObject.IfShowUI = false;.IfShowUI = false;
DWObject.IfDisableSourceAfterAcquire = true;DWObject.IfDisableSourceAfterAcquire = true;
DWObject.OpenSource();DWObject.OpenSource();
DWObject.IfShowIndicator = false;DWObject.IfShowIndicator = false;
DWObject.AcquireImage();DWObject.AcquireImage();

问题3：如何分别设置水平和垂直分辨率？

答：代码如下：

DWObject.SelectSource();.SelectSource();
DWObject.OpenSource();DWObject.OpenSource();

//Set XRESOLUTION current value.//Set XRESOLUTION current value.
DWObject.Capability = 0x1118; //ICAP_XRESOLUTIONDWObject.Capability = 0x1118; //ICAP_XRESOLUTION
DWObject.CapType = 5; //TWON_ONEVALUEDWObject.CapType = 5; //TWON_ONEVALUE
DWObject.CapValue = 300;DWObject.CapValue = 300;
if (DWObject.CapSet == false){if (DWObject.CapSet == false){
    alert( "Failed to set the x-resolution. " + DWObject.ErrorString);( "Failed to set the x-resolution. " + DWObject.ErrorString);
}}

//Set YRESOLUTION current value.//Set YRESOLUTION current value.
DWObject.Capability = 0x1119; //ICAP_YRESOLUTIONDWObject.Capability = 0x1119; //ICAP_YRESOLUTION
DWObject.CapType = 5; //TWON_ONEVALUEDWObject.CapType = 5; //TWON_ONEVALUE
DWObject.CapValue = 200;DWObject.CapValue = 200;
if (DWObject.CapSet == false){if (DWObject.CapSet == false){
   alert( "Failed to set the y-resolution." + DWObject.ErrorString);( "Failed to set the y-resolution." + DWObject.ErrorString);
}}

DWObject.AcquireImage();DWObject.AcquireImage();

相关内容推荐：

Dynamic Web TWAIN常见问题（一）：如何选择使用哪个版本？
Dynamic Web TWAIN常见问题（二）：相比其他的TWAIN SDK，主要优势是什么？
Dynamic Web TWAIN常见问题（三）：Dynamic Web TWAIN将使用哪些操作系统？
Dynamic Web TWAIN常见问题（四）：编程问题-没有用户界面怎么工作？